On 9/13/2017 9:02 AM, Robby Van Mieghem wrote: > Hi > > is there a way with header_checks to check if a field does not exist ? > > We want to reject mails that do not include the field > X-MS-Exchange-CrossTenant-id
No, header_checks cannot check for a missing header. It examines each header individually with no knowledge of other headers. You'll need to use a milter or content_filter to check for missing headers. -- Noel Jones
